Materials Literature
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Fosinopril is one of the most hydrophobic substances among the angiotensin-converting enzyme inhibitors, exhibiting low water solubility and poor bioavailability following oral administration. Inclusion complexes between the drug substance and cyclodextrins (CDs) were obtained in order to improve its solubility. The p…
Coupled nanofibers consisting of cobalt oxide (Co 3 O 4 and zinc oxide (ZnO) were prepared by the electrospinning process, and tested as a photocatalyst for dye degradation.Initially, electrospinning of a sol-gel consisting of cobalt acetate/zinc acetate/poly(vinyl alcohol) was used to produce polymeric nanofibers.Cal…
Fluornatromicrolite is a new mineral species of the pyrochlore supergroup (microlite group), with fluorine dominant at the second anion site. The type locality is the Alto Quixaba granitic pegmatite near Quixaba village, municipality of Frei Martinho, Paraiba, Brazil. Fluornatromicrolite forms adamantine green regular…
Diffraction prevents the spatial resolution of fluorescent species co-localized within areas of nanoscaled dimensions. As a result, conventional fluorescence microscopes cannot resolve structural features at the molecular level. Time, however, can be exploited to distinguish fluorophores within the same subdiffraction…
A simple one-step method was used for preparing the beta-cyclodextrin/polyacrylonitrile (PAN) nanofibers deposited with silver nanoparticles by electrospinning and followed by the reduction of the Ag+ ions. The nano-composite fibers were stabilized at 280 degrees C in air and activated at 800 degrees C for 1 h in stea…
Corrosion and inhibitor protection of mild steel specimens immersed in acid chloride solution was investigated at ambient temperature by gravimetric and potential monitoring methods. The electrode potential monitoring was performed using a digital voltmeter and a saturated calomel electrode (SCE) as the reference elec…
Here, we present a direct observation of fatigue phenomena in epitaxially grown Pb(Zr0.2Ti0.8)O3 (PZT) thin films using second harmonic piezoresponse force microscopy (SH-PFM). We observed strong correlation between the SH-PFM amplitude and phase signals with the remnant piezoresponse at different switching cycles. Th…
The effect of plasma parameters (e.g., electron density and temperature, ion density and temperature, neutral atom density, and temperature) on the growth (without a catalyst), structure, and field emission of electrons from a cylindrical metallic carbon nanotube (CNT) surfaces has been theoretically investigated. A t…
Polymer based composites have received high interest due to their unusual combination of stiffness and toughness that are difficult to attain from individual components. For this reason, they have been widely used in areas of transportation, construction, electronics and consumer products. Nanocomposites exhibiting a…
Heat removal is one of the major challenges faced in developing the new generation of high density integrated circuits. Future design technologies strongly depend on the availability of efficient means for thermal modeling and analysis. These thermal models must be also accurate and provide the most efficient level of…
The effect of oxygen plasma on gallium oxide films formed by electrochemical oxidation of n-GaAs wafers with a donor concentration N d = (1–2) × 1016 cm−3 has been investigated. It is shown that the treatment in an oxygen plasma at a temperature of 50–90°C increases the concentration of β-phase crystallites, which cau…
The electromigration lifetimes of Cu-based interconnects are strongly influenced by whether voids are present before electromigration, and by where fatal voids initially form and grow. Modeling, simulations, and comparisons with in situ experiments are used to establish criteria for void formation away from the cathod…
We demonstrate that Pt/PSi composite powders can be prepared by a simple method involving the metal-assisted electroless chemical etching of Si powders. In X-ray photoelectron spectroscopy and optical measurements, Pt layers are deposited on a Si surface together with the formation of a porous structure. It is found t…
Abstract A novel indium‐boron (In–B) amorphous alloy was prepared by chemical reduction of indi‐ um(III) ions [In 3+ ] with borohydride [BH 4 − ] in aqueous solution and was applied to the water‐medium Barbier‐type allylation reactions. A variety of allyl halides could be efficiently added to aldehydes or ketones in w…
Localized structures forming in the bistable regimes in a chain of weakly coupled split ring resonators, which are the building blocks of a nonlinear magnetic metamaterial, where electric current is generated by external electromagnetic radiation, have been studied analytically and numerically. The hysteresis of the v…
The elastic moduli and propagation velocities of elastic waves in 2D supracrystalline nanoallotropes of carbon have been calculated. It has been shown that these velocities in sp 2 nanoallotropes are close to those in graphene and exceed the propagation velocities of elastic waves in single-crystal diamond by a factor…
According to first-principles density functional calculations, we have investigated the magnetic properties of Mn-doped GaN with defects, Ga 1− x − y V G x Mn y N 1− z − t V N z O t with Mn substituted at Ga sites, nitrogen vacancies V N , gallium vacancies V G and oxygen substituted at nitrogen sites. The magnetic in…
There is no known fundamental limit to the performance of thermoelectric materials as characterized by the dimensionless figure of merit, ZT, and in fact there has been significant recent progress in improving the performance of practical materials. Here we discuss some of the issues involved in improving ZT starting…
Time-resolved photoluminescence measurements of silicon nanocrystals formed by ion implantation of silicon into silicon dioxide reveal multi-exponential luminescence decays. Three discrete time components are apparent in the rise and decay data, which we associate with different classes of nanocrystals. The values of…
Potentiodynamic polarization and linear polarization resistance electrochemical techniques were used to assess the corrosion behavior of Ni20(% wt.)Cr, NiCrAl, NiCrAlY2O3, NiCrAlCoY2O3 and Cr2C3-Ni20Cr metallic coatings in simulated body fluid environment. Hank´s solution was used for simulating body fluid environment…